Final answer:
An adult should not be in charge of more than two infants (children ages 0 to 2.5) at a time, as recommended by childcare regulations to ensure each child receives proper care and attention.
Step-by-step explanation:
When considering how many infants an adult is allowed to be in charge of, it is essential to follow guidelines that ensure the safety and well-being of the children. The correct answer to the question is b) 2. According to most standard childcare regulations and guidelines, an adult should not be responsible for more than two infants at a time. This is to ensure that each infant receives adequate attention and care. These regulations typically apply to childcare settings and are important for maintaining a safe environment for children ages 0 to 2.5. It is not recommended for one adult to supervise more than this number of infants because of the high level of care that very young children require.